| 1 | #ifndef _IPV6_H |
| 2 | #define _IPV6_H |
| 3 | |
| 4 | #include <linux/types.h> |
| 5 | #include <linux/in6.h> |
| 6 | #include <asm/byteorder.h> |
| 7 | |
| 8 | /* The latest drafts declared increase in minimal mtu up to 1280. */ |
| 9 | |
| 10 | #define IPV6_MIN_MTU 1280 |
| 11 | |
| 12 | /* |
| 13 | * Advanced API |
| 14 | * source interface/address selection, source routing, etc... |
| 15 | * *under construction* |
| 16 | */ |
| 17 | |
| 18 | |
| 19 | struct in6_pktinfo { |
| 20 | struct in6_addr ipi6_addr; |
| 21 | int ipi6_ifindex; |
| 22 | }; |
| 23 | |
| 24 | |
| 25 | struct in6_ifreq { |
| 26 | struct in6_addr ifr6_addr; |
| 27 | __u32 ifr6_prefixlen; |
| 28 | int ifr6_ifindex; |
| 29 | }; |
| 30 | |
| 31 | #define IPV6_SRCRT_STRICT 0x01 /* Deprecated; will be removed */ |
| 32 | #define IPV6_SRCRT_TYPE_0 0 /* Deprecated; will be removed */ |
| 33 | #define IPV6_SRCRT_TYPE_2 2 /* IPv6 type 2 Routing Header */ |
| 34 | |
| 35 | /* |
| 36 | * routing header |
| 37 | */ |
| 38 | struct ipv6_rt_hdr { |
| 39 | __u8 nexthdr; |
| 40 | __u8 hdrlen; |
| 41 | __u8 type; |
| 42 | __u8 segments_left; |
| 43 | |
| 44 | /* |
| 45 | * type specific data |
| 46 | * variable length field |
| 47 | */ |
| 48 | }; |
| 49 | |
| 50 | |
| 51 | struct ipv6_opt_hdr { |
| 52 | __u8 nexthdr; |
| 53 | __u8 hdrlen; |
| 54 | /* |
| 55 | * TLV encoded option data follows. |
| 56 | */ |
| 57 | } __attribute__ ((packed)); /* required for some archs */ |
| 58 | |
| 59 | #define ipv6_destopt_hdr ipv6_opt_hdr |
| 60 | #define ipv6_hopopt_hdr ipv6_opt_hdr |
| 61 | |
| 62 | #ifdef __KERNEL__ |
| 63 | #define ipv6_optlen(p) (((p)->hdrlen+1) << 3) |
| 64 | #endif |
| 65 | |
| 66 | /* |
| 67 | * routing header type 0 (used in cmsghdr struct) |
| 68 | */ |
| 69 | |
| 70 | struct rt0_hdr { |
| 71 | struct ipv6_rt_hdr rt_hdr; |
| 72 | __u32 reserved; |
| 73 | struct in6_addr addr[0]; |
| 74 | |
| 75 | #define rt0_type rt_hdr.type |
| 76 | }; |
| 77 | |
| 78 | /* |
| 79 | * routing header type 2 |
| 80 | */ |
| 81 | |
| 82 | struct rt2_hdr { |
| 83 | struct ipv6_rt_hdr rt_hdr; |
| 84 | __u32 reserved; |
| 85 | struct in6_addr addr; |
| 86 | |
| 87 | #define rt2_type rt_hdr.type |
| 88 | }; |
| 89 | |
| 90 | /* |
| 91 | * home address option in destination options header |
| 92 | */ |
| 93 | |
| 94 | struct ipv6_destopt_hao { |
| 95 | __u8 type; |
| 96 | __u8 length; |
| 97 | struct in6_addr addr; |
| 98 | } __attribute__ ((__packed__)); |
| 99 | |
| 100 | /* |
| 101 | * IPv6 fixed header |
| 102 | * |
| 103 | * BEWARE, it is incorrect. The first 4 bits of flow_lbl |
| 104 | * are glued to priority now, forming "class". |
| 105 | */ |
| 106 | |
| 107 | struct ipv6hdr { |
| 108 | #if defined(__LITTLE_ENDIAN_BITFIELD) |
| 109 | __u8 priority:4, |
| 110 | version:4; |
| 111 | #elif defined(__BIG_ENDIAN_BITFIELD) |
| 112 | __u8 version:4, |
| 113 | priority:4; |
| 114 | #else |
| 115 | #error "Please fix <asm/byteorder.h>" |
| 116 | #endif |
| 117 | __u8 flow_lbl[3]; |
| 118 | |
| 119 | __be16 payload_len; |
| 120 | __u8 nexthdr; |
| 121 | __u8 hop_limit; |
| 122 | |
| 123 | struct in6_addr saddr; |
| 124 | struct in6_addr daddr; |
| 125 | }; |
| 126 | |
| 127 | #ifdef __KERNEL__ |
| 128 | /* |
| 129 | * This structure contains configuration options per IPv6 link. |
| 130 | */ |
| 131 | struct ipv6_devconf { |
| 132 | __s32 forwarding; |
| 133 | __s32 hop_limit; |
| 134 | __s32 mtu6; |
| 135 | __s32 accept_ra; |
| 136 | __s32 accept_redirects; |
| 137 | __s32 autoconf; |
| 138 | __s32 dad_transmits; |
| 139 | __s32 rtr_solicits; |
| 140 | __s32 rtr_solicit_interval; |
| 141 | __s32 rtr_solicit_delay; |
| 142 | __s32 force_mld_version; |
| 143 | #ifdef CONFIG_IPV6_PRIVACY |
| 144 | __s32 use_tempaddr; |
| 145 | __s32 temp_valid_lft; |
| 146 | __s32 temp_prefered_lft; |
| 147 | __s32 regen_max_retry; |
| 148 | __s32 max_desync_factor; |
| 149 | #endif |
| 150 | __s32 max_addresses; |
| 151 | __s32 accept_ra_defrtr; |
| 152 | __s32 accept_ra_pinfo; |
| 153 | #ifdef CONFIG_IPV6_ROUTER_PREF |
| 154 | __s32 accept_ra_rtr_pref; |
| 155 | __s32 rtr_probe_interval; |
| 156 | #ifdef CONFIG_IPV6_ROUTE_INFO |
| 157 | __s32 accept_ra_rt_info_max_plen; |
| 158 | #endif |
| 159 | #endif |
| 160 | __s32 proxy_ndp; |
| 161 | __s32 accept_source_route; |
| 162 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD |
| 163 | __s32 optimistic_dad; |
| 164 | #endif |
| 165 | #ifdef CONFIG_IPV6_MROUTE |
| 166 | __s32 mc_forwarding; |
| 167 | #endif |
| 168 | __s32 disable_ipv6; |
| 169 | __s32 accept_dad; |
| 170 | void *sysctl; |
| 171 | }; |
| 172 | #endif |
| 173 | |
| 174 | /* index values for the variables in ipv6_devconf */ |
| 175 | enum { |
| 176 | DEVCONF_FORWARDING = 0, |
| 177 | DEVCONF_HOPLIMIT, |
| 178 | DEVCONF_MTU6, |
| 179 | DEVCONF_ACCEPT_RA, |
| 180 | DEVCONF_ACCEPT_REDIRECTS, |
| 181 | DEVCONF_AUTOCONF, |
| 182 | DEVCONF_DAD_TRANSMITS, |
| 183 | DEVCONF_RTR_SOLICITS, |
| 184 | DEVCONF_RTR_SOLICIT_INTERVAL, |
| 185 | DEVCONF_RTR_SOLICIT_DELAY, |
| 186 | DEVCONF_USE_TEMPADDR, |
| 187 | DEVCONF_TEMP_VALID_LFT, |
| 188 | DEVCONF_TEMP_PREFERED_LFT, |
| 189 | DEVCONF_REGEN_MAX_RETRY, |
| 190 | DEVCONF_MAX_DESYNC_FACTOR, |
| 191 | DEVCONF_MAX_ADDRESSES, |
| 192 | DEVCONF_FORCE_MLD_VERSION, |
| 193 | DEVCONF_ACCEPT_RA_DEFRTR, |
| 194 | DEVCONF_ACCEPT_RA_PINFO, |
| 195 | DEVCONF_ACCEPT_RA_RTR_PREF, |
| 196 | DEVCONF_RTR_PROBE_INTERVAL, |
| 197 | DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN, |
| 198 | DEVCONF_PROXY_NDP, |
| 199 | DEVCONF_OPTIMISTIC_DAD, |
| 200 | DEVCONF_ACCEPT_SOURCE_ROUTE, |
| 201 | DEVCONF_MC_FORWARDING, |
| 202 | DEVCONF_DISABLE_IPV6, |
| 203 | DEVCONF_ACCEPT_DAD, |
| 204 | DEVCONF_MAX |
| 205 | }; |
| 206 | |
| 207 | #ifdef __KERNEL__ |
| 208 | #include <linux/icmpv6.h> |
| 209 | #include <linux/tcp.h> |
| 210 | #include <linux/udp.h> |
| 211 | |
| 212 | #include <net/inet_sock.h> |
| 213 | |
| 214 | static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb) |
| 215 | { |
| 216 | return (struct ipv6hdr *)skb_network_header(skb); |
| 217 | } |
| 218 | |
| 219 | static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb) |
| 220 | { |
| 221 | return (struct ipv6hdr *)skb_transport_header(skb); |
| 222 | } |
| 223 | |
| 224 | /* |
| 225 | This structure contains results of exthdrs parsing |
| 226 | as offsets from skb->nh. |
| 227 | */ |
| 228 | |
| 229 | struct inet6_skb_parm { |
| 230 | int iif; |
| 231 | __u16 ra; |
| 232 | __u16 hop; |
| 233 | __u16 dst0; |
| 234 | __u16 srcrt; |
| 235 | __u16 dst1; |
| 236 | __u16 lastopt; |
| 237 | __u32 nhoff; |
| 238 | __u16 flags; |
| 239 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
| 240 | __u16 dsthao; |
| 241 | #endif |
| 242 | |
| 243 | #define IP6SKB_XFRM_TRANSFORMED 1 |
| 244 | #define IP6SKB_FORWARDED 2 |
| 245 | }; |
| 246 | |
| 247 | #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb)) |
| 248 | |
| 249 | static inline int inet6_iif(const struct sk_buff *skb) |
| 250 | { |
| 251 | return IP6CB(skb)->iif; |
| 252 | } |
| 253 | |
| 254 | struct inet6_request_sock { |
| 255 | struct in6_addr loc_addr; |
| 256 | struct in6_addr rmt_addr; |
| 257 | struct sk_buff *pktopts; |
| 258 | int iif; |
| 259 | }; |
| 260 | |
| 261 | struct tcp6_request_sock { |
| 262 | struct tcp_request_sock tcp6rsk_tcp; |
| 263 | struct inet6_request_sock tcp6rsk_inet6; |
| 264 | }; |
| 265 | |
| 266 | struct ipv6_mc_socklist; |
| 267 | struct ipv6_ac_socklist; |
| 268 | struct ipv6_fl_socklist; |
| 269 | |
| 270 | /** |
| 271 | * struct ipv6_pinfo - ipv6 private area |
| 272 | * |
| 273 | * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc) |
| 274 | * this _must_ be the last member, so that inet6_sk_generic |
| 275 | * is able to calculate its offset from the base struct sock |
| 276 | * by using the struct proto->slab_obj_size member. -acme |
| 277 | */ |
| 278 | struct ipv6_pinfo { |
| 279 | struct in6_addr saddr; |
| 280 | struct in6_addr rcv_saddr; |
| 281 | struct in6_addr daddr; |
| 282 | struct in6_pktinfo sticky_pktinfo; |
| 283 | struct in6_addr *daddr_cache; |
| 284 | #ifdef CONFIG_IPV6_SUBTREES |
| 285 | struct in6_addr *saddr_cache; |
| 286 | #endif |
| 287 | |
| 288 | __be32 flow_label; |
| 289 | __u32 frag_size; |
| 290 | |
| 291 | /* |
| 292 | * Packed in 16bits. |
| 293 | * Omit one shift by by putting the signed field at MSB. |
| 294 | */ |
| 295 | #if defined(__BIG_ENDIAN_BITFIELD) |
| 296 | __s16 hop_limit:9; |
| 297 | __u16 __unused_1:7; |
| 298 | #else |
| 299 | __u16 __unused_1:7; |
| 300 | __s16 hop_limit:9; |
| 301 | #endif |
| 302 | |
| 303 | #if defined(__BIG_ENDIAN_BITFIELD) |
| 304 | /* Packed in 16bits. */ |
| 305 | __s16 mcast_hops:9; |
| 306 | __u16 __unused_2:6, |
| 307 | mc_loop:1; |
| 308 | #else |
| 309 | __u16 mc_loop:1, |
| 310 | __unused_2:6; |
| 311 | __s16 mcast_hops:9; |
| 312 | #endif |
| 313 | int mcast_oif; |
| 314 | |
| 315 | /* pktoption flags */ |
| 316 | union { |
| 317 | struct { |
| 318 | __u16 srcrt:1, |
| 319 | osrcrt:1, |
| 320 | rxinfo:1, |
| 321 | rxoinfo:1, |
| 322 | rxhlim:1, |
| 323 | rxohlim:1, |
| 324 | hopopts:1, |
| 325 | ohopopts:1, |
| 326 | dstopts:1, |
| 327 | odstopts:1, |
| 328 | rxflow:1, |
| 329 | rxtclass:1; |
| 330 | } bits; |
| 331 | __u16 all; |
| 332 | } rxopt; |
| 333 | |
| 334 | /* sockopt flags */ |
| 335 | __u8 recverr:1, |
| 336 | sndflow:1, |
| 337 | pmtudisc:2, |
| 338 | ipv6only:1, |
| 339 | srcprefs:3; /* 001: prefer temporary address |
| 340 | * 010: prefer public address |
| 341 | * 100: prefer care-of address |
| 342 | */ |
| 343 | __u8 tclass; |
| 344 | |
| 345 | __u32 dst_cookie; |
| 346 | |
| 347 | struct ipv6_mc_socklist *ipv6_mc_list; |
| 348 | struct ipv6_ac_socklist *ipv6_ac_list; |
| 349 | struct ipv6_fl_socklist *ipv6_fl_list; |
| 350 | |
| 351 | struct ipv6_txoptions *opt; |
| 352 | struct sk_buff *pktoptions; |
| 353 | struct { |
| 354 | struct ipv6_txoptions *opt; |
| 355 | u8 hop_limit; |
| 356 | u8 tclass; |
| 357 | } cork; |
| 358 | }; |
| 359 | |
| 360 | /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */ |
| 361 | struct raw6_sock { |
| 362 | /* inet_sock has to be the first member of raw6_sock */ |
| 363 | struct inet_sock inet; |
| 364 | __u32 checksum; /* perform checksum */ |
| 365 | __u32 offset; /* checksum offset */ |
| 366 | struct icmp6_filter filter; |
| 367 | /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */ |
| 368 | struct ipv6_pinfo inet6; |
| 369 | }; |
| 370 | |
| 371 | struct udp6_sock { |
| 372 | struct udp_sock udp; |
| 373 | /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */ |
| 374 | struct ipv6_pinfo inet6; |
| 375 | }; |
| 376 | |
| 377 | struct tcp6_sock { |
| 378 | struct tcp_sock tcp; |
| 379 | /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */ |
| 380 | struct ipv6_pinfo inet6; |
| 381 | }; |
| 382 | |
| 383 | extern int inet6_sk_rebuild_header(struct sock *sk); |
| 384 | |
| 385 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 386 | static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) |
| 387 | { |
| 388 | return inet_sk(__sk)->pinet6; |
| 389 | } |
| 390 | |
| 391 | static inline struct inet6_request_sock * |
| 392 | inet6_rsk(const struct request_sock *rsk) |
| 393 | { |
| 394 | return (struct inet6_request_sock *)(((u8 *)rsk) + |
| 395 | inet_rsk(rsk)->inet6_rsk_offset); |
| 396 | } |
| 397 | |
| 398 | static inline u32 inet6_rsk_offset(struct request_sock *rsk) |
| 399 | { |
| 400 | return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock); |
| 401 | } |
| 402 | |
| 403 | static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops) |
| 404 | { |
| 405 | struct request_sock *req = reqsk_alloc(ops); |
| 406 | |
| 407 | if (req != NULL) { |
| 408 | inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req); |
| 409 | inet6_rsk(req)->pktopts = NULL; |
| 410 | } |
| 411 | |
| 412 | return req; |
| 413 | } |
| 414 | |
| 415 | static inline struct raw6_sock *raw6_sk(const struct sock *sk) |
| 416 | { |
| 417 | return (struct raw6_sock *)sk; |
| 418 | } |
| 419 | |
| 420 | static inline void inet_sk_copy_descendant(struct sock *sk_to, |
| 421 | const struct sock *sk_from) |
| 422 | { |
| 423 | int ancestor_size = sizeof(struct inet_sock); |
| 424 | |
| 425 | if (sk_from->sk_family == PF_INET6) |
| 426 | ancestor_size += sizeof(struct ipv6_pinfo); |
| 427 | |
| 428 | __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size); |
| 429 | } |
| 430 | |
| 431 | #define __ipv6_only_sock(sk) (inet6_sk(sk)->ipv6only) |
| 432 | #define ipv6_only_sock(sk) ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk)) |
| 433 | |
| 434 | struct inet6_timewait_sock { |
| 435 | struct in6_addr tw_v6_daddr; |
| 436 | struct in6_addr tw_v6_rcv_saddr; |
| 437 | }; |
| 438 | |
| 439 | struct tcp6_timewait_sock { |
| 440 | struct tcp_timewait_sock tcp6tw_tcp; |
| 441 | struct inet6_timewait_sock tcp6tw_inet6; |
| 442 | }; |
| 443 | |
| 444 | static inline u16 inet6_tw_offset(const struct proto *prot) |
| 445 | { |
| 446 | return prot->twsk_prot->twsk_obj_size - |
| 447 | sizeof(struct inet6_timewait_sock); |
| 448 | } |
| 449 | |
| 450 | static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk) |
| 451 | { |
| 452 | return (struct inet6_timewait_sock *)(((u8 *)sk) + |
| 453 | inet_twsk(sk)->tw_ipv6_offset); |
| 454 | } |
| 455 | |
| 456 | static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk) |
| 457 | { |
| 458 | return likely(sk->sk_state != TCP_TIME_WAIT) ? |
| 459 | &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr; |
| 460 | } |
| 461 | |
| 462 | static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk) |
| 463 | { |
| 464 | return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL; |
| 465 | } |
| 466 | |
| 467 | static inline int inet_v6_ipv6only(const struct sock *sk) |
| 468 | { |
| 469 | return likely(sk->sk_state != TCP_TIME_WAIT) ? |
| 470 | ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only; |
| 471 | } |
| 472 | #else |
| 473 | #define __ipv6_only_sock(sk) 0 |
| 474 | #define ipv6_only_sock(sk) 0 |
| 475 | |
| 476 | static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) |
| 477 | { |
| 478 | return NULL; |
| 479 | } |
| 480 | |
| 481 | static inline struct inet6_request_sock * |
| 482 | inet6_rsk(const struct request_sock *rsk) |
| 483 | { |
| 484 | return NULL; |
| 485 | } |
| 486 | |
| 487 | static inline struct raw6_sock *raw6_sk(const struct sock *sk) |
| 488 | { |
| 489 | return NULL; |
| 490 | } |
| 491 | |
| 492 | #define __inet6_rcv_saddr(__sk) NULL |
| 493 | #define inet6_rcv_saddr(__sk) NULL |
| 494 | #define tcp_twsk_ipv6only(__sk) 0 |
| 495 | #define inet_v6_ipv6only(__sk) 0 |
| 496 | #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */ |
| 497 | |
| 498 | #define INET6_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif)\ |
| 499 | (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net) && \ |
| 500 | ((*((__portpair *)&(inet_sk(__sk)->dport))) == (__ports)) && \ |
| 501 | ((__sk)->sk_family == AF_INET6) && \ |
| 502 | ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr)) && \ |
| 503 | ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \ |
| 504 | (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif)))) |
| 505 | |
| 506 | #define INET6_TW_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif) \ |
| 507 | (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net) && \ |
| 508 | (*((__portpair *)&(inet_twsk(__sk)->tw_dport)) == (__ports)) && \ |
| 509 | ((__sk)->sk_family == PF_INET6) && \ |
| 510 | (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_daddr, (__saddr))) && \ |
| 511 | (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_rcv_saddr, (__daddr))) && \ |
| 512 | (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif)))) |
| 513 | |
| 514 | #endif /* __KERNEL__ */ |
| 515 | |
| 516 | #endif /* _IPV6_H */ |